1225000000 has 189 divisors, whose sum is σ = 3534666159. Its totient is φ = 420000000.

The previous prime is 1224999973. The next prime is 1225000001. The reversal of 1225000000 is 5221.

The square root of 1225000000 is 35000.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 870958144 + 354041856 = 29512^2 + 18816^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1225000001) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 174999997 + ... + 175000003.

Almost surely, 2^1225000000 is an apocalyptic number.

1225000000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1225000000 is the 35000-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1225000000

1225000000 is an abundant number, since it is smaller than the sum of its proper divisors (2309666159).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1225000000 is an frugal number, since it uses more digits than its factorization.

1225000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66 (or 14 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 10.

The cubic root of 1225000000 is about 1069.9874805651.

Adding to 1225000000 its reverse (5221), we get a palindrome (1225005221).

The spelling of 1225000000 in words is "one billion, two hundred twenty-five million", and thus it is an aban number.